linux/net/mac80211/iface.c

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/*
* Interface handling (except master interface)
*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "debugfs_netdev.h"
#include "mesh.h"
#include "led.h"
/**
* DOC: Interface list locking
*
* The interface list in each struct ieee80211_local is protected
* three-fold:
*
* (1) modifications may only be done under the RTNL
* (2) modifications and readers are protected against each other by
* the iflist_mtx.
* (3) modifications are done in an RCU manner so atomic readers
* can traverse the list in RCU-safe blocks.
*
* As a consequence, reads (traversals) of the list can be protected
* by either the RTNL, the iflist_mtx or RCU.
*/
static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
{
int meshhdrlen;
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
/* FIX: what would be proper limits for MTU?
* This interface uses 802.3 frames. */
if (new_mtu < 256 ||
new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
return -EINVAL;
}
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
dev->mtu = new_mtu;
return 0;
}
static inline int identical_mac_addr_allowed(int type1, int type2)
{
return type1 == NL80211_IFTYPE_MONITOR ||
type2 == NL80211_IFTYPE_MONITOR ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
(type1 == NL80211_IFTYPE_WDS &&
(type2 == NL80211_IFTYPE_WDS ||
type2 == NL80211_IFTYPE_AP)) ||
(type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
(type1 == NL80211_IFTYPE_AP_VLAN &&
(type2 == NL80211_IFTYPE_AP ||
type2 == NL80211_IFTYPE_AP_VLAN));
}
static int ieee80211_open(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_sub_if_data *nsdata;
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
struct ieee80211_if_init_conf conf;
u32 changed = 0;
int res;
u32 hw_reconf_flags = 0;
u8 null_addr[ETH_ALEN] = {0};
/* fail early if user set an invalid address */
if (compare_ether_addr(dev->dev_addr, null_addr) &&
!is_valid_ether_addr(dev->dev_addr))
return -EADDRNOTAVAIL;
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
if (ndev != dev && netif_running(ndev)) {
/*
* Allow only a single IBSS interface to be up at any
* time. This is restricted because beacon distribution
* cannot work properly if both are in the same IBSS.
*
* To remove this restriction we'd have to disallow them
* from setting the same SSID on different IBSS interfaces
* belonging to the same hardware. Then, however, we're
* faced with having to adopt two different TSF timers...
*/
if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
nsdata->vif.type == NL80211_IFTYPE_ADHOC)
return -EBUSY;
/*
* The remaining checks are only performed for interfaces
* with the same MAC address.
*/
if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
continue;
/*
* check whether it may have the same address
*/
if (!identical_mac_addr_allowed(sdata->vif.type,
nsdata->vif.type))
return -ENOTUNIQ;
/*
* can only add VLANs to enabled APs
*/
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
nsdata->vif.type == NL80211_IFTYPE_AP)
sdata->bss = &nsdata->u.ap;
}
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_WDS:
if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
return -ENOLINK;
break;
case NL80211_IFTYPE_AP_VLAN:
if (!sdata->bss)
return -ENOLINK;
list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
break;
case NL80211_IFTYPE_AP:
sdata->bss = &sdata->u.ap;
break;
case NL80211_IFTYPE_MESH_POINT:
if (!ieee80211_vif_is_mesh(&sdata->vif))
break;
/* mesh ifaces must set allmulti to forward mcast traffic */
atomic_inc(&local->iff_allmultis);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_ADHOC:
/* no special treatment */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
/* cannot happen */
WARN_ON(1);
break;
}
if (local->open_count == 0) {
res = 0;
if (local->ops->start)
res = local->ops->start(local_to_hw(local));
if (res)
goto err_del_bss;
/* we're brought up, everything changes */
hw_reconf_flags = ~0;
ieee80211_led_radio(local, local->hw.conf.radio_enabled);
}
/*
* Check all interfaces and copy the hopefully now-present
* MAC address to those that have the special null one.
*/
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
/*
* No need to check netif_running since we do not allow
* it to start up with this invalid address.
*/
if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
memcpy(ndev->dev_addr,
local->hw.wiphy->perm_addr,
ETH_ALEN);
}
if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
ETH_ALEN);
/*
* Validate the MAC address for this device.
*/
if (!is_valid_ether_addr(dev->dev_addr)) {
if (!local->open_count && local->ops->stop)
local->ops->stop(local_to_hw(local));
return -EADDRNOTAVAIL;
}
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs++;
break;
}
/* must be before the call to ieee80211_configure_filter */
local->monitors++;
if (local->monitors == 1) {
local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control++;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss++;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_ADHOC:
if (sdata->vif.type == NL80211_IFTYPE_STATION)
sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
else
sdata->u.ibss.flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
/* fall through */
default:
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = dev->dev_addr;
res = local->ops->add_interface(local_to_hw(local), &conf);
if (res)
goto err_stop;
if (ieee80211_vif_is_mesh(&sdata->vif)) {
local->fif_other_bss++;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
ieee80211_start_mesh(sdata);
}
changed |= ieee80211_reset_erp_info(sdata);
ieee80211_bss_info_change_notify(sdata, changed);
ieee80211_enable_keys(sdata);
if (sdata->vif.type == NL80211_IFTYPE_STATION)
netif_carrier_off(dev);
else
netif_carrier_on(dev);
}
if (sdata->vif.type == NL80211_IFTYPE_WDS) {
/* Create STA entry for the WDS peer */
sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
GFP_KERNEL);
if (!sta) {
res = -ENOMEM;
goto err_del_interface;
}
/* no locking required since STA is not live yet */
sta->flags |= WLAN_STA_AUTHORIZED;
res = sta_info_insert(sta);
if (res) {
/* STA has been freed */
goto err_del_interface;
}
}
if (local->open_count == 0) {
res = dev_open(local->mdev);
WARN_ON(res);
if (res)
goto err_del_interface;
tasklet_enable(&local->tx_pending_tasklet);
tasklet_enable(&local->tasklet);
}
/*
* set_multicast_list will be invoked by the networking core
* which will check whether any increments here were done in
* error and sync them down to the hardware as filter flags.
*/
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_inc(&local->iff_allmultis);
if (sdata->flags & IEEE80211_SDATA_PROMISC)
atomic_inc(&local->iff_promiscs);
local->open_count++;
if (hw_reconf_flags) {
ieee80211_hw_config(local, hw_reconf_flags);
/*
* set default queue parameters so drivers don't
* need to initialise the hardware if the hardware
* doesn't start up with sane defaults
*/
ieee80211_set_wmm_default(sdata);
}
/*
* ieee80211_sta_work is disabled while network interface
* is down. Therefore, some configuration changes may not
* yet be effective. Trigger execution of ieee80211_sta_work
* to fix this.
*/
if (sdata->vif.type == NL80211_IFTYPE_STATION)
queue_work(local->hw.workqueue, &sdata->u.mgd.work);
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
queue_work(local->hw.workqueue, &sdata->u.ibss.work);
netif_tx_start_all_queues(dev);
return 0;
err_del_interface:
local->ops->remove_interface(local_to_hw(local), &conf);
err_stop:
if (!local->open_count && local->ops->stop)
local->ops->stop(local_to_hw(local));
err_del_bss:
sdata->bss = NULL;
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
list_del(&sdata->u.vlan.list);
return res;
}
static int ieee80211_stop(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_init_conf conf;
struct sta_info *sta;
u32 hw_reconf_flags = 0;
/*
* Stop TX on this interface first.
*/
netif_tx_stop_all_queues(dev);
/*
* Now delete all active aggregation sessions.
*/
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list, list) {
if (sta->sdata == sdata)
ieee80211_sta_tear_down_BA_sessions(sta);
}
rcu_read_unlock();
/*
* Announce that we are leaving the network, in case we are a
* station interface type. This must be done before removing
* all stations associated with sta_info_flush, otherwise STA
* information will be gone and no announce being done.
*/
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
ieee80211_sta_deauthenticate(sdata,
WLAN_REASON_DEAUTH_LEAVING);
}
/*
* Remove all stations associated with this interface.
*
* This must be done before calling ops->remove_interface()
* because otherwise we can later invoke ops->sta_notify()
* whenever the STAs are removed, and that invalidates driver
* assumptions about always getting a vif pointer that is valid
* (because if we remove a STA after ops->remove_interface()
* the driver will have removed the vif info already!)
*
* We could relax this and only unlink the stations from the
* hash table and list but keep them on a per-sdata list that
* will be inserted back again when the interface is brought
* up again, but I don't currently see a use case for that,
* except with WDS which gets a STA entry created when it is
* brought up.
*/
sta_info_flush(local, sdata);
/*
* Don't count this interface for promisc/allmulti while it
* is down. dev_mc_unsync() will invoke set_multicast_list
* on the master interface which will sync these down to the
* hardware as filter flags.
*/
if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
atomic_dec(&local->iff_allmultis);
if (sdata->flags & IEEE80211_SDATA_PROMISC)
atomic_dec(&local->iff_promiscs);
dev_mc_unsync(local->mdev, dev);
del_timer_sync(&local->dynamic_ps_timer);
cancel_work_sync(&local->dynamic_ps_enable_work);
/* APs need special treatment */
if (sdata->vif.type == NL80211_IFTYPE_AP) {
struct ieee80211_sub_if_data *vlan, *tmp;
struct beacon_data *old_beacon = sdata->u.ap.beacon;
/* remove beacon */
rcu_assign_pointer(sdata->u.ap.beacon, NULL);
synchronize_rcu();
kfree(old_beacon);
/* down all dependent devices, that is VLANs */
list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
u.vlan.list)
dev_close(vlan->dev);
WARN_ON(!list_empty(&sdata->u.ap.vlans));
}
local->open_count--;
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP_VLAN:
list_del(&sdata->u.vlan.list);
/* no need to tell driver */
break;
case NL80211_IFTYPE_MONITOR:
if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
local->cooked_mntrs--;
break;
}
local->monitors--;
if (local->monitors == 0) {
local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
local->fif_control--;
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss--;
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
break;
case NL80211_IFTYPE_STATION:
memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
del_timer_sync(&sdata->u.mgd.chswitch_timer);
del_timer_sync(&sdata->u.mgd.timer);
/*
* If the timer fired while we waited for it, it will have
* requeued the work. Now the work will be running again
* but will not rearm the timer again because it checks
* whether the interface is running, which, at this point,
* it no longer is.
*/
cancel_work_sync(&sdata->u.mgd.work);
cancel_work_sync(&sdata->u.mgd.chswitch_work);
cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
/*
* When we get here, the interface is marked down.
* Call synchronize_rcu() to wait for the RX path
* should it be using the interface and enqueuing
* frames at this very time on another CPU.
*/
synchronize_rcu();
skb_queue_purge(&sdata->u.mgd.skb_queue);
sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
IEEE80211_STA_TKIP_WEP_USED);
kfree(sdata->u.mgd.extra_ie);
sdata->u.mgd.extra_ie = NULL;
sdata->u.mgd.extra_ie_len = 0;
/* fall through */
case NL80211_IFTYPE_ADHOC:
if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
del_timer_sync(&sdata->u.ibss.timer);
cancel_work_sync(&sdata->u.ibss.work);
synchronize_rcu();
skb_queue_purge(&sdata->u.ibss.skb_queue);
}
/* fall through */
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif)) {
/* other_bss and allmulti are always set on mesh
* ifaces */
local->fif_other_bss--;
atomic_dec(&local->iff_allmultis);
netif_addr_lock_bh(local->mdev);
ieee80211_configure_filter(local);
netif_addr_unlock_bh(local->mdev);
ieee80211_stop_mesh(sdata);
}
/* fall through */
default:
if (local->scan_sdata == sdata) {
if (!local->ops->hw_scan)
cancel_delayed_work_sync(&local->scan_work);
/*
* The software scan can no longer run now, so we can
* clear out the scan_sdata reference. However, the
* hardware scan may still be running. The complete
* function must be prepared to handle a NULL value.
*/
local->scan_sdata = NULL;
/*
* The memory barrier guarantees that another CPU
* that is hardware-scanning will now see the fact
* that this interface is gone.
*/
smp_mb();
/*
* If software scanning, complete the scan but since
* the scan_sdata is NULL already don't send out a
* scan event to userspace -- the scan is incomplete.
*/
if (local->sw_scanning)
ieee80211_scan_completed(&local->hw, true);
}
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = dev->dev_addr;
/* disable all keys for as long as this netdev is down */
ieee80211_disable_keys(sdata);
local->ops->remove_interface(local_to_hw(local), &conf);
}
sdata->bss = NULL;
if (local->open_count == 0) {
if (netif_running(local->mdev))
dev_close(local->mdev);
if (local->ops->stop)
local->ops->stop(local_to_hw(local));
ieee80211_led_radio(local, 0);
flush_workqueue(local->hw.workqueue);
tasklet_disable(&local->tx_pending_tasklet);
tasklet_disable(&local->tasklet);
/* no reconfiguring after stop! */
hw_reconf_flags = 0;
}
/* do after stop to avoid reconfiguring when we stop anyway */
if (hw_reconf_flags)
ieee80211_hw_config(local, hw_reconf_flags);
return 0;
}
static void ieee80211_set_multicast_list(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
int allmulti, promisc, sdata_allmulti, sdata_promisc;
allmulti = !!(dev->flags & IFF_ALLMULTI);
promisc = !!(dev->flags & IFF_PROMISC);
sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
if (allmulti != sdata_allmulti) {
if (dev->flags & IFF_ALLMULTI)
atomic_inc(&local->iff_allmultis);
else
atomic_dec(&local->iff_allmultis);
sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
}
if (promisc != sdata_promisc) {
if (dev->flags & IFF_PROMISC)
atomic_inc(&local->iff_promiscs);
else
atomic_dec(&local->iff_promiscs);
sdata->flags ^= IEEE80211_SDATA_PROMISC;
}
dev_mc_sync(local->mdev, dev);
}
/*
* Called when the netdev is removed or, by the code below, before
* the interface type changes.
*/
static void ieee80211_teardown_sdata(struct net_device *dev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = sdata->local;
struct beacon_data *beacon;
struct sk_buff *skb;
int flushed;
int i;
/* free extra data */
ieee80211_free_keys(sdata);
ieee80211_debugfs_remove_netdev(sdata);
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
__skb_queue_purge(&sdata->fragments[i].skb_list);
sdata->fragment_next = 0;
[MAC80211]: rework key handling This moves all the key handling code out from ieee80211_ioctl.c into key.c and also does the following changes including documentation updates in mac80211.h: 1) Turn off hardware acceleration for keys when the interface is down. This is necessary because otherwise monitor interfaces could be decrypting frames for other interfaces that are down at the moment. Also, it should go some way towards better suspend/resume support, in any case the routines used here could be used for that as well. Additionally, this makes the driver interface nicer, keys for a specific local MAC address are only ever present while an interface with that MAC address is enabled. 2) Change driver set_key() callback interface to allow only return values of -ENOSPC, -EOPNOTSUPP and 0, warn on all other return values. This allows debugging the stack when a driver notices it's handed a key while it is down. 3) Invert the flag meaning to KEY_FLAG_UPLOADED_TO_HARDWARE. 4) Remove REMOVE_ALL_KEYS command as it isn't used nor do we want to use it, we'll use DISABLE_KEY for each key. It is hard to use REMOVE_ALL_KEYS because we can handle multiple virtual interfaces with different key configuration, so we'd have to keep track of a lot of state for this and that isn't worth it. 5) Warn when disabling a key fails, it musn't. 6) Remove IEEE80211_HW_NO_TKIP_WMM_HWACCEL in favour of per-key IEEE80211_KEY_FLAG_WMM_STA to let driver sort it out itself. 7) Tell driver that a (non-WEP) key is used only for transmission by using an all-zeroes station MAC address when configuring. 8) Change the set_key() callback to have access to the local MAC address the key is being added for. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-28 21:01:55 +00:00
switch (sdata->vif.type) {
case NL80211_IFTYPE_AP:
beacon = sdata->u.ap.beacon;
rcu_assign_pointer(sdata->u.ap.beacon, NULL);
synchronize_rcu();
kfree(beacon);
while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
local->total_ps_buffered--;
dev_kfree_skb(skb);
}
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_rmc_free(sdata);
break;
case NL80211_IFTYPE_ADHOC:
kfree_skb(sdata->u.ibss.probe_resp);
break;
case NL80211_IFTYPE_STATION:
kfree(sdata->u.mgd.extra_ie);
kfree(sdata->u.mgd.assocreq_ies);
kfree(sdata->u.mgd.assocresp_ies);
kfree(sdata->u.mgd.sme_auth_ie);
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_MONITOR:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
flushed = sta_info_flush(local, sdata);
WARN_ON(flushed);
}
static const struct net_device_ops ieee80211_dataif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_subif_start_xmit,
.ndo_set_multicast_list = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
};
static const struct net_device_ops ieee80211_monitorif_ops = {
.ndo_open = ieee80211_open,
.ndo_stop = ieee80211_stop,
.ndo_uninit = ieee80211_teardown_sdata,
.ndo_start_xmit = ieee80211_monitor_start_xmit,
.ndo_set_multicast_list = ieee80211_set_multicast_list,
.ndo_change_mtu = ieee80211_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
};
static void ieee80211_if_setup(struct net_device *dev)
{
ether_setup(dev);
dev->netdev_ops = &ieee80211_dataif_ops;
dev->wireless_handlers = &ieee80211_iw_handler_def;
dev->destructor = free_netdev;
}
/*
* Helper function to initialise an interface to a specific type.
*/
static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
/* clear type-dependent union */
memset(&sdata->u, 0, sizeof(sdata->u));
/* and set some type-dependent values */
sdata->vif.type = type;
sdata->dev->netdev_ops = &ieee80211_dataif_ops;
sdata->wdev.iftype = type;
/* only monitor differs */
sdata->dev->type = ARPHRD_ETHER;
switch (type) {
case NL80211_IFTYPE_AP:
skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
INIT_LIST_HEAD(&sdata->u.ap.vlans);
break;
case NL80211_IFTYPE_STATION:
ieee80211_sta_setup_sdata(sdata);
break;
case NL80211_IFTYPE_ADHOC:
ieee80211_ibss_setup_sdata(sdata);
break;
case NL80211_IFTYPE_MESH_POINT:
if (ieee80211_vif_is_mesh(&sdata->vif))
ieee80211_mesh_init_sdata(sdata);
break;
case NL80211_IFTYPE_MONITOR:
sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
MONITOR_FLAG_OTHER_BSS;
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_AP_VLAN:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case __NL80211_IFTYPE_AFTER_LAST:
BUG();
break;
}
ieee80211_debugfs_add_netdev(sdata);
}
int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
enum nl80211_iftype type)
{
ASSERT_RTNL();
if (type == sdata->vif.type)
return 0;
/* Setting ad-hoc mode on non-IBSS channel is not supported. */
if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
type == NL80211_IFTYPE_ADHOC)
return -EOPNOTSUPP;
/*
* We could, here, on changes between IBSS/STA/MESH modes,
* invoke an MLME function instead that disassociates etc.
* and goes into the requested mode.
*/
if (netif_running(sdata->dev))
return -EBUSY;
/* Purge and reset type-dependent state. */
ieee80211_teardown_sdata(sdata->dev);
ieee80211_setup_sdata(sdata, type);
/* reset some values that shouldn't be kept across type changes */
sdata->vif.bss_conf.basic_rates =
ieee80211_mandatory_rates(sdata->local,
sdata->local->hw.conf.channel->band);
sdata->drop_unencrypted = 0;
return 0;
}
int ieee80211_if_add(struct ieee80211_local *local, const char *name,
struct net_device **new_dev, enum nl80211_iftype type,
struct vif_params *params)
{
struct net_device *ndev;
struct ieee80211_sub_if_data *sdata = NULL;
int ret, i;
ASSERT_RTNL();
ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
name, ieee80211_if_setup);
if (!ndev)
return -ENOMEM;
ndev->needed_headroom = local->tx_headroom +
4*6 /* four MAC addresses */
+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
+ 6 /* mesh */
+ 8 /* rfc1042/bridge tunnel */
- ETH_HLEN /* ethernet hard_header_len */
+ IEEE80211_ENCRYPT_HEADROOM;
ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
ret = dev_alloc_name(ndev, ndev->name);
if (ret < 0)
goto fail;
memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
ndev->features |= NETIF_F_NETNS_LOCAL;
/* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
sdata = netdev_priv(ndev);
ndev->ieee80211_ptr = &sdata->wdev;
/* initialise type-independent data */
sdata->wdev.wiphy = local->hw.wiphy;
sdata->local = local;
sdata->dev = ndev;
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
skb_queue_head_init(&sdata->fragments[i].skb_list);
INIT_LIST_HEAD(&sdata->key_list);
sdata->force_unicast_rateidx = -1;
sdata->max_ratectrl_rateidx = -1;
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
ret = register_netdevice(ndev);
if (ret)
goto fail;
if (ieee80211_vif_is_mesh(&sdata->vif) &&
params && params->mesh_id_len)
ieee80211_sdata_set_mesh_id(sdata,
params->mesh_id_len,
params->mesh_id);
mutex_lock(&local->iflist_mtx);
list_add_tail_rcu(&sdata->list, &local->interfaces);
mutex_unlock(&local->iflist_mtx);
if (new_dev)
*new_dev = ndev;
return 0;
fail:
free_netdev(ndev);
return ret;
}
void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
{
ASSERT_RTNL();
[MAC80211]: rework key handling This moves all the key handling code out from ieee80211_ioctl.c into key.c and also does the following changes including documentation updates in mac80211.h: 1) Turn off hardware acceleration for keys when the interface is down. This is necessary because otherwise monitor interfaces could be decrypting frames for other interfaces that are down at the moment. Also, it should go some way towards better suspend/resume support, in any case the routines used here could be used for that as well. Additionally, this makes the driver interface nicer, keys for a specific local MAC address are only ever present while an interface with that MAC address is enabled. 2) Change driver set_key() callback interface to allow only return values of -ENOSPC, -EOPNOTSUPP and 0, warn on all other return values. This allows debugging the stack when a driver notices it's handed a key while it is down. 3) Invert the flag meaning to KEY_FLAG_UPLOADED_TO_HARDWARE. 4) Remove REMOVE_ALL_KEYS command as it isn't used nor do we want to use it, we'll use DISABLE_KEY for each key. It is hard to use REMOVE_ALL_KEYS because we can handle multiple virtual interfaces with different key configuration, so we'd have to keep track of a lot of state for this and that isn't worth it. 5) Warn when disabling a key fails, it musn't. 6) Remove IEEE80211_HW_NO_TKIP_WMM_HWACCEL in favour of per-key IEEE80211_KEY_FLAG_WMM_STA to let driver sort it out itself. 7) Tell driver that a (non-WEP) key is used only for transmission by using an all-zeroes station MAC address when configuring. 8) Change the set_key() callback to have access to the local MAC address the key is being added for. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-28 21:01:55 +00:00
mutex_lock(&sdata->local->iflist_mtx);
list_del_rcu(&sdata->list);
mutex_unlock(&sdata->local->iflist_mtx);
synchronize_rcu();
unregister_netdevice(sdata->dev);
}
/*
* Remove all interfaces, may only be called at hardware unregistration
* time because it doesn't do RCU-safe list removals.
*/
void ieee80211_remove_interfaces(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata, *tmp;
ASSERT_RTNL();
list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
/*
* we cannot hold the iflist_mtx across unregister_netdevice,
* but we only need to hold it for list modifications to lock
* out readers since we're under the RTNL here as all other
* writers.
*/
mutex_lock(&local->iflist_mtx);
list_del(&sdata->list);
mutex_unlock(&local->iflist_mtx);
unregister_netdevice(sdata->dev);
}
}